Daily Report for 27th November 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.9 °C (+1.1) 15:11 7.4 °C (+2.2) 9.2 °C (+5.4), 2014 -3.5 °C (-7.3), 2010
Maximum Temperature 8.1 °C (-1.2) 14:41 12.3 °C (+2.0) 13.7 °C (+4.4), 2015 1.0 °C (-8.3), 2010
Mean Temperature 6.1 °C (-0.1) 9.7 °C (+2.1) 10.8 °C, 2015 -1.5 °C, 2010
Minimum Humidity 76% 13:09 73% 91%, 2014 47%, 2011
Maximum Humidity 88% 22:06 94% 98%, 2012 79%, 2016
Mean Humidity 84% 86% 94%, 2014 68%, 2011
Minimum Pressure 996 hPa 02:43 997 hPa 1031 hPa, 2013 981 hPa, 2019
Maximum Pressure 1000 hPa 19:40 1007 hPa 1035 hPa, 2013 989 hPa, 2019
Mean Pressure 998 hPa 1002 hPa 1033 hPa, 2013 985 hPa, 2019
Mean Wind Speed 5.9 mph (+1.3) 6.1 mph (+1.5) 7.7 mph, 2017 1.2 mph, 2020
Maximum Wind Speed 13.8 mph 14.1 mph 20.8 mph, 2015 5.9 mph, 2013
Maximum Gust 20.4 mph 12:11 20.5 mph 30.8 mph, 2015 7.8 mph, 2013
Mean Wind Direction SW
Rainfall 0.0 mm 98.1 mm (182%) 8.1 mm, 2019
Maximum Hourly Rain n/a 2, 2019
Maximum 10-min Rain n/a 1.2, 2012
Maximum Rain Rate n/a 18, 2015
Minimum Dew Point 2.9 °C 07:06 5.1 °C 8.3 °C, 2014 -5.8 °C, 2010
Maximum Dew Point 4.2 °C 17:43 9.9 °C 12.0 °C, 2015 -0.4 °C, 2010
Mean Dew Point 3.6 °C 7.4 °C 9.0 °C, 2019 -3.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.9 °C 7.9 °C 11.6 °C, 2011 -3.5 °C, 2010
Day Maximum (09-21) 8.1 °C 12.0 °C 13.7 °C, 2015 1.0 °C, 2010
Max 10m Temp Rise 0.8 °C 09:11 0.5 °C 0.9 °C, 2020 0.2 °C, 2011
Max 1hr Temp Rise 1.9 °C 10:46 1.1 °C 2.0 °C, 2020 0.5 °C, 2011
Max 1hr Hum Rise 8% 17:36 6% 9%, 2016 1%, 2014
Max 10m Temp Fall 0.5 °C 04:26 0.4 °C 1.2 °C, 2015 0.2 °C, 2012
Max 1hr Temp Fall 1.1 °C 16:50 1.0 °C 3.4 °C, 2015 0.5 °C, 2014
Max 1hr Hum Fall 10% 11:06 8% 10%, 2009 2%, 2013
Max 10m Wind Speed 11.4 mph 12:47 10.4 mph 17.3 mph, 2015 4.4 mph, 2013
Minimum Feels-like 1.7 °C 07:10 5.9 °C 6.9 °C, 2014 -8.4 °C, 2010
Maximum Feels-like 8.1 °C 14:41 14.1 °C 15.9 °C, 2015 1.0 °C, 2010
Mean Feels-like 4.7 °C 9.8 °C 11.2 °C, 2015 -3.5 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 19 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.2 °C (-2.3) 4.9 °C (-0.2) 9.7 °C (+4.2), 2011 1.4 °C (-4.1), 2014
Humidity Range 12% 22% 38%, 2011 7%, 2014
Pressure Range 4 hPa 9 hPa 16 hPa, 2015 4 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [40%]63 hrs (93%) [29%] 6 [81%], 2011 0 [0%], 2012
Wet Hours 071 hrs (126%) [11%] 10, 2019 0, 2009
Cloud Cover not available
Events None
Comments -
Extra Comments
Issues ALL MONTH: Rainfall data is approximate and 10-min totals & rain rates are unavailable due to 5-min logging, but monthly sum is correct.
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs are initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
View monthly summary

Daily Graph of Conditions

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose